Bug 2383907 (CVE-2025-38483) - CVE-2025-38483 kernel: comedi: das16m1: Fix bit shift out of bounds
Summary: CVE-2025-38483 kernel: comedi: das16m1: Fix bit shift out of bounds
Keywords:
Status: NEW
Alias: CVE-2025-38483
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-07-28 12:02 UTC by OSIDB Bzimport
Modified: 2025-07-28 15:26 UTC (History)
0 users

Fixed In Version:
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Description OSIDB Bzimport 2025-07-28 12:02:24 UTC
In the Linux kernel, the following vulnerability has been resolved:

comedi: das16m1: Fix bit shift out of bounds

When checking for a supported IRQ number, the following test is used:

	/* only irqs 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, and 15 are valid */
	if ((1 << it->options[1]) & 0xdcfc) {

However, `it->options[i]` is an unchecked `int` value from userspace, so
the shift amount could be negative or out of bounds.  Fix the test by
requiring `it->options[1]` to be within bounds before proceeding with
the original test.

Comment 1 Avinash Hanwate 2025-07-28 15:23:42 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025072815-CVE-2025-38483-ab88@gregkh/T


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